Photography of Shock Waves During Excimer Laser Ablation of the CorneaEffect of Helium Gas on Propagation Velocity
作者:
Ronald Krueger,
Jerzy Krasinski,
Czeslaw Radzewicz,
Karl Stonecipher,
J James Rowsey,
期刊:
Cornea
(OVID Available online 1993)
卷期:
Volume 12,
issue 4
页码: 330-334
ISSN:0277-3740
年代: 1993
出版商: OVID
关键词: Excimer laser;Shock wave;Photography;Helium
数据来源: OVID
摘要:
Shadow photography of shock waves excited by means of a xenon chloride excimer laser was performed to determine the shock wave propagation velocity in air, nitrogen and helium. Energy densities between 500 and 2,000 mJ/ cm2were used to ablate a rotating rubber cylindrical target and porcine corneas. In ablating the rubber cylinder, a shock wave velocity of 3.3 km/s was generated in air and nitrogen at 40 ns; this decreased to 1.4 km/s at 320 ns. When helium was blown on the target, the velocity increased by a factor of approximately two, to 5.9 km/s at 40 ns and 2.7 km/s at 320 ns. We suggest that blowing helium on the surface of the cornea during excimer laser ablation may speed the dissipation of high-energy acoustic waves and gaseous particles, and thus reduce the exposure and transfer of heat energy to the surrounding tissue.
点击下载:
PDF
(440KB)
返 回